DOMUI: Refactor navigateToPage and fix the case where we reload a non-browser page on startup.
DOMUI: Refactor navigateToPage and fix the case where we reload a non-browser
page on startup.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/6312136

git-svn-id: http://src.chromium.org/svn/trunk/src@73704 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: e6febecc81bf7e90649e082529db085e2d5c1409
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser